Hypnos was the god of sleep.
He was the Greek god of the sun his realm was the sun but in the original ancient Greek Parthenon he was one of the 12 Olympians of Mt. Olympus
he is in charge of the underworld
The underworld, the realm of the dead.
Greek
it is within its realm
Hera is Greek. Her Roman equivalent is Juno.
The Greek goddess Aphrodite was the goddess of love.
She was the Greek goddess of war and wisdom.
she was the goddess of love and beauty
God's realm includes the physical universe. Were it expressed in Venn Diagram--God's realm would be a big circle; the physical universe would be a smaller circle, entirely within the big circle.
No, not really. A realm means a kingdom, a political entity, something much less than the whole world. England is a realm (That is why they have a Defense of the Realm Act.) It only means a general topic ( as in "the realm of literature") in a figurative sense. "World" or "universe" have that meaning also only in a figurative sense.
The KING of the gods the ruler the one mostly in charge.